Mainstay, a San Francisco-based provider of an intelligent system of record for residential real estate, has raised over $18 million in funding. Backers included Parker89, Stackpoint, Alpaca VC, FJ Labs, Khosla Ventures, Era Ventures, and Clocktower Technology Ventures. The company will use the funds to expand operations and development efforts. Led by chief executive officer Dod Fraser, Mainstay provides an agentic platform connecting data, decisions, and execution across the residential asset lifecycle. The solution combines proprietary and external data sources into a single record for every property, using agentic automation to handle workflows across transaction execution, property taxes, HOA management, and payments.

Calgary-based Ultimarii has raised $13 million in combined equity and debt financing. BDC Capital's Industrial Innovation Venture Fund led the round, with participation from Mistral Venture Partners, Staircase Ventures and Alpaca VC. The National Research Council of Canada's Industrial Research Assistance Program is also providing funding. The startup develops AI tools that help regulatory agencies, law firms and companies in power, mining and energy industries manage regulatory and permitting applications. The system uses datasets from past government processes and human expertise. Doug Schweitzer, Alberta's former justice and innovation minister, founded Ultimarii in January 2024 with Josh Malate. The company plans to expand internationally, starting with US datasets.

Applied Atomics, a developer of full-stack nuclear power plants, has raised $8.3 million in an oversubscribed seed round. The Los Angeles-based company is designing 100MW to 1GW nuclear power plants co-located with large infrastructure campuses, using light-water reactor architecture. The startup plans to own and operate its plants, delivering electricity under long-term power purchase agreements. It's working with early customers to secure locations for 10GW of planned capacity. The funding will support testing and integration, supply chain development, and engineering integration. Applied Atomics has completed initial systems validation milestones on its SimBox digital twin platform, testing plant control logic and safety responses with supply chain components. The round was co-led by Transition, with participation from Alpaca VC. The company aims to address nuclear deployment challenges through integrated delivery rather than fragmented project models.